Department of Orthopaedic Surgery, Kobe University Graduate School of Medicine, 7-5-1 Kusunoki-cho, Chuo-ku, Kobe, Hyogo, 650-0017, Japan.
BMC Musculoskelet Disord. 2022 Jun 10;23(1):563. doi: 10.1186/s12891-022-05513-4.
Quercetin, a flavonoid abundantly in vegetables and fruits, exerts antioxidant and anti-inflammatory effects. We investigated the protective effects of quercetin against oxidative stress in the Achilles tendons of diabetic rats.
Cells were collected from the Achilles tendons of Sprague-Dawley rats and cultured under four conditions: regular glucose (RG) without quercetin (Quer-), RG with quercetin (Quer +), high-glucose (HG) Quer-, and HG Quer + . The expression of genes related to NADPH oxidase (NOX) and inflammation, reactive oxygen species accumulation, and apoptosis rates was analyzed. Additionally, diabetic rats were divided into two groups and subjected to quercetin (group Q) or no quercetin (group C) treatment. Histological evaluation and expression analysis of relevant genes in the Achilles tendon were performed.
In rat tendon-derived cells, the expression of Nox1, Nox4, and Il6; reactive oxygen species accumulation; and apoptosis rates were significantly decreased by quercetin treatment in the HG group. The collagen fiber arrangement was significantly disorganized in the diabetic rat Achilles tendons in group C compared with that in group Q. The mRNA and protein expression levels of NOX1 and NOX4 were significantly decreased upon quercetin treatment. Furthermore, the expression of Il6, type III collagen, Mmp2, and Timp2 was significantly decreased, whereas that of type I collagen was significantly increased in group Q compared with that in group C.
Quercetin treatment decreases NOX expression and thus exerts antioxidant and anti-inflammatory effects in the Achilles tendons of diabetic rats. Quercetin treatment may be effective against diabetic tendinopathy.
槲皮素是一种在蔬菜和水果中含量丰富的类黄酮,具有抗氧化和抗炎作用。我们研究了槲皮素对糖尿病大鼠跟腱氧化应激的保护作用。
从 Sprague-Dawley 大鼠的跟腱中收集细胞,并在四种条件下培养:无槲皮素的常规葡萄糖(RG)(Quer-)、有槲皮素的 RG(Quer+)、高葡萄糖(HG) Quer-和 HG Quer+。分析与 NADPH 氧化酶(NOX)和炎症、活性氧积累和细胞凋亡率相关的基因表达。此外,将糖尿病大鼠分为两组,分别给予槲皮素(Q 组)或无槲皮素(C 组)治疗。对跟腱的组织学评价和相关基因的表达分析。
在大鼠肌腱源性细胞中,HG 组中槲皮素处理可显著降低 Nox1、Nox4 和 Il6 的表达、活性氧积累和细胞凋亡率。与 Q 组相比,C 组糖尿病大鼠跟腱中的胶原纤维排列明显紊乱。Q 组中 NOX1 和 NOX4 的 mRNA 和蛋白表达水平明显降低。此外,与 C 组相比,Q 组中 Il6、III 型胶原、Mmp2 和 Timp2 的表达明显降低,而 I 型胶原的表达明显增加。
槲皮素治疗可降低 NOX 的表达,从而发挥抗氧化和抗炎作用,改善糖尿病大鼠的跟腱病变。槲皮素治疗可能对糖尿病性肌腱病有效。